// Copyright 2020 New Relic, Inc. All rights reserved.
// SPDX-License-Identifier: Apache-2.0


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using NewRelic.Agent.IntegrationTestHelpers;
using NewRelic.Agent.IntegrationTestHelpers.RemoteServiceFixtures;
using NewRelic.Testing.Assertions;
using NewRelic.Agent.Tests.TestSerializationHelpers.Models;
using Xunit;

namespace NewRelic.Agent.IntegrationTests.CatOutbound
{
    public class CatEnabledChainedRequestsWebRequest : NewRelicIntegrationTest<RemoteServiceFixtures.BasicMvcApplicationTestFixture>
    {

        private RemoteServiceFixtures.BasicMvcApplicationTestFixture _fixture;


        private HttpResponseHeaders _responseHeaders;

        public CatEnabledChainedRequestsWebRequest(RemoteServiceFixtures.BasicMvcApplicationTestFixture fixture, ITestOutputHelper output) : base(fixture)
        {
            _fixture = fixture;
            _fixture.TestLogger = output;
            _fixture.Actions
            (
                setupConfiguration: () =>
                {
                    var configPath = fixture.DestinationNewRelicConfigFilePath;
                    var configModifier = new NewRelicConfigModifier(configPath);

                    configModifier.ForceTransactionTraces();
                    configModifier.EnableCat();
                },
                exerciseApplication: () =>
                {
                    _fixture.GetIgnored();
                    _responseHeaders = _fixture.GetWithCatHeaderChainedWebRequest(requestData: new CrossApplicationRequestData("guid", false, "tripId", "pathHash"));
                }
            );
            _fixture.Initialize();
        }

        [Fact]
        [Trait("feature", "CAT-DistributedTracing")]
        public void Test()
        {
            var catResponseHeader = _responseHeaders.GetValues(@"X-NewRelic-App-Data")?.FirstOrDefault();
            Assert.NotNull(catResponseHeader);

            var catResponseData = HeaderEncoder.DecodeAndDeserialize<CrossApplicationResponseData>(catResponseHeader, HeaderEncoder.IntegrationTestEncodingKey);

            var metrics = _fixture.AgentLog.GetMetrics().ToList();
            var calleeTransactionEvent = _fixture.AgentLog.TryGetTransactionEvent("WebTransaction/MVC/DefaultController/Index");
            Assert.NotNull(calleeTransactionEvent);

            var callerTransactionTrace = _fixture.AgentLog.TryGetTransactionSample("WebTransaction/MVC/DefaultController/ChainedWebRequest");
            Assert.NotNull(callerTransactionTrace);

            var crossProcessId = _fixture.AgentLog.GetCrossProcessId();

            // Note: we are checking the metrics that are generated by the *Caller* as a result of receiving a CAT response.
            var expectedMetrics = new List<Assertions.ExpectedMetric>
            {
                new Assertions.ExpectedMetric { metricName = @"External/all", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = @"External/allWeb", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = $@"External/{RemoteApplication.DestinationServerName}/all", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = $@"ExternalApp/{RemoteApplication.DestinationServerName}/{crossProcessId}/all", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = $@"ExternalTransaction/{RemoteApplication.DestinationServerName}/{crossProcessId}/WebTransaction/MVC/DefaultController/Index", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = $@"ExternalTransaction/{RemoteApplication.DestinationServerName}/{crossProcessId}/WebTransaction/MVC/DefaultController/Index", metricScope = @"WebTransaction/MVC/DefaultController/ChainedWebRequest", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = $@"External/{RemoteApplication.DestinationServerName}/Stream/GET", callCount = 1 },
                new Assertions.ExpectedMetric { metricName = @"ClientApplication/[^/]+/all", IsRegexName = true }
            };
            var unexpectedMetrics = new List<Assertions.ExpectedMetric>
            {
				// This scoped metric should be superceded by the ExternalTransaction metric above
				new Assertions.ExpectedMetric { metricName = $@"External/{RemoteApplication.DestinationServerName}/Stream/GET", metricScope = @"WebTransaction/MVC/DefaultController/ChainedWebRequest" }
            };
            // Note: we are checking the attributes attached to the *Callee's* transaction, not the caller's transaction. The attributes attached to the caller's transaction are already fully vetted in the CatInbound tests.
            var expectedTransactionEventIntrinsicAttributes1 = new List<string>
            {
                "nr.guid",
                "nr.pathHash",
                "nr.referringPathHash",
                "nr.referringTransactionGuid"
            };
            var expectedTransactionEventIntrinsicAttributes2 = new Dictionary<string, string>
            {
				// This value comes from what we send to the application (see parameter passed to GetWithCatHeader above)
				{"nr.tripId", "tripId"}
            };
            var expectedCallerTraceSegmentParameters = new List<Assertions.ExpectedSegmentParameter>
            {
                new Assertions.ExpectedSegmentParameter { segmentName = "ExternalTransaction/[^/]+/[^/]+/WebTransaction/MVC/DefaultController/Index", IsRegexSegmentName = true, parameterName = "transaction_guid"}
            };

            NrAssert.Multiple(
                () => Assert.Equal(crossProcessId, catResponseData.CrossProcessId),
                () => Assert.Equal("WebTransaction/MVC/DefaultController/ChainedWebRequest", catResponseData.TransactionName),
                () => Assert.True(catResponseData.QueueTimeInSeconds >= 0),
                () => Assert.True(catResponseData.ResponseTimeInSeconds >= 0),
                () => Assert.Equal(-1, catResponseData.ContentLength),
                () => Assert.NotNull(catResponseData.TransactionGuid),
                () => Assert.False(catResponseData.Unused),

                () => Assertions.MetricsExist(expectedMetrics, metrics),
                () => Assertions.MetricsDoNotExist(unexpectedMetrics, metrics),

                // Note: It is difficult (perhaps impossible) to ensure that a transaction trace is generate for the chained request. This is because only one transaction trace is collected per harvest, and the chained requests will both be eligible.

                // calleeTransactionEvent attributes
                () => Assertions.TransactionEventHasAttributes(expectedTransactionEventIntrinsicAttributes1, TransactionEventAttributeType.Intrinsic, calleeTransactionEvent),
                () => Assertions.TransactionEventHasAttributes(expectedTransactionEventIntrinsicAttributes2, TransactionEventAttributeType.Intrinsic, calleeTransactionEvent),

                // callerTransactionTrace segments
                () => Assertions.TransactionTraceSegmentParametersExist(expectedCallerTraceSegmentParameters, callerTransactionTrace)
            );
        }
    }
}
